Vue：ElementUI 扩展实现树形结构表格组件的勾父选子、半勾选、过滤出半勾选节点功能

<template>
  <el-table
    :data="tableData"
    row-key="id"
    :expand-row-keys="expandRowKeys"
    :tree-props="{ children: 'children' }"
    @expand-change="handleExpandChange"
  >
    <el-table-column type="expand">
      <template slot-scope="scope">
        <tree-table :data="scope.row.children" />
      </template>
    </el-table-column>
    <el-table-column
      type="selection"
      width="55"
      :reserve-selection="true"
      :selectable="checkSelectable"
    >
      <template slot-scope="scope">
        <el-checkbox
          :value="isSelected(scope.row)"
          @change="handleCheckChange(scope.row, $event)"
        ></el-checkbox>
      </template>
    </el-table-column>
    <!-- 其他列定义 -->
  </el-table>
</template>
 
<script>
export default {
  name: 'TreeTable',
  props: {
    data: Array
  },
  data() {
    return {
      expandRowKeys: [],
      selected: new Set()
    };
  },
  methods: {
    handleExpandChange(row, expandedRows) {
      if (expandedRows.length) {
        this.expandRowKeys = [row.id];
      } else {
        this.expandRowKeys = [];
      }
    },
    handleCheckChange(row, checked) {
      if (checked) {
        this.selectParent(row);
        this.selectChildren(row, checked);
      } else {
        this.unselectParent(row);
        this.unselectChildren(row);
      }
    },
    selectParent(row) {
      if (row.parentId) {
        const parent = this.findById(row.parentId);
        if (parent && !this.isSelected(parent)) {
          this.selected.add(parent);
        }
      }
    },
    selectChildren(row, checked) {
      const children = (row.children || []).filter(child => !this.isSelected(child));
      children.forEach(child => {
        this.selected.add(child);
        this.selectChildren(child, checked);
      });
    },
    unselectParent(row) {
      if (row.parentId) {
        const parent = this.findById(row.parentId);
        if (parent && this.isSelected(parent) && this.allChildrenUnselected(parent)) {
          this.selected.delete(parent);
        }
      }
    },
    unselectChildren(row) {
      const children = (row.children || []).filter(this.isSelected);
      children.forEach(child => {
        this.selected.delete(child);
        this.unselectChildren(child);
      });
    },
    findById(id) {
      return this.data.find(item => item.id === id);
    },
    isSelected(row) {
      return t